Remove obsoleted RelatedLinks picker (replaced by Multi URL Picker)

(cherry picked from commit fedf0c78de)

src/Umbraco.Web/Models/RelatedLink.cs

@@ -1,11 +0,0 @@
-using Umbraco.Core.Models.PublishedContent;
-
-namespace Umbraco.Web.Models
-{
-    public class RelatedLink : RelatedLinkBase
-    {
-        public int? Id { get; internal set; }
-        internal bool IsDeleted { get; set; }
-        public IPublishedContent Content { get; set; }
-    }
-}

src/Umbraco.Web/Models/RelatedLinkBase.cs

@@ -1,18 +0,0 @@
-using Newtonsoft.Json;
-
-namespace Umbraco.Web.Models
-{
-    public abstract class RelatedLinkBase
-    {
-        [JsonProperty("caption")]
-        public string Caption { get; set; }
-        [JsonProperty("link")]
-        public string Link { get; set; }
-        [JsonProperty("newWindow")]
-        public bool NewWindow { get; set; }
-        [JsonProperty("isInternal")]
-        public bool IsInternal { get; set; }
-        [JsonProperty("type")]
-        public RelatedLinkType Type { get; set; }
-    }
-}

src/Umbraco.Web/Models/RelatedLinkType.cs

@@ -1,27 +0,0 @@
-// --------------------------------------------------------------------------------------------------------------------
-// <copyright file="RelatedLinkType.cs" company="Umbraco">
-//   Umbraco
-// </copyright>
-// <summary>
-//   Defines the RelatedLinkType type.
-// </summary>
-// --------------------------------------------------------------------------------------------------------------------
-
-namespace Umbraco.Web.Models
-{
-    /// <summary>
-    /// The related link type.
-    /// </summary>
-    public enum RelatedLinkType
-    {
-        /// <summary>
-        /// Internal link type
-        /// </summary>
-        Internal,
-
-        /// <summary>
-        /// External link type
-        /// </summary>
-        External
-    }
-}

src/Umbraco.Web/Models/RelatedLinks.cs

@@ -1,42 +0,0 @@
-using System.Collections;
-using System.Collections.Generic;
-using System.ComponentModel;
-using System.Linq;
-
-namespace Umbraco.Web.Models
-{
-    [TypeConverter(typeof(RelatedLinksTypeConverter))]
-    public class RelatedLinks : IEnumerable<RelatedLink>
-    {
-        private readonly string _propertyData;
-
-        private readonly IEnumerable<RelatedLink> _relatedLinks;
-
-        public RelatedLinks(IEnumerable<RelatedLink> relatedLinks, string propertyData)
-        {
-            _relatedLinks = relatedLinks;
-            _propertyData = propertyData;
-        }
-
-        /// <summary>
-        /// Gets the property data.
-        /// </summary>
-        internal string PropertyData
-        {
-            get
-            {
-                return this._propertyData;
-            }
-        }
-
-        public IEnumerator<RelatedLink> GetEnumerator()
-        {
-            return _relatedLinks.GetEnumerator();
-        }
-
-        IEnumerator IEnumerable.GetEnumerator()
-        {
-            return this.GetEnumerator();
-        }
-    }
-}